Tool apparatus and method

Abstract

The invention relates to a tool apparatus ( 10 ) with a drivable tool ( 1 ), comprising a shaft ( 2 ) which is coupled to the tool ( 1 ), further comprising one or plural braking bodies ( 3 ) which in particular are arranged distributed around the shaft ( 2 ) in the circumferential direction, wherein the tool apparatus ( 10 ) is adapted to bring the one or plural braking bodies ( 3 ) from a release state into a braking state in the course of a braking procedure, wherein in the braking state the one or the plural braking bodies ( 3 ) are in contact with the shaft and thereby exert a braking force upon the shaft ( 2 ), so that the shaft ( 2 ) and thereby also the tool ( 1 ) are braked and wherein in the release state the one or the plural braking bodies ( 3 ) are not in contact with the shaft ( 2 ).

The invention claimed is: 
     
       1. A tool apparatus with a drivable tool, the tool apparatus comprising a shaft which is coupled to the tool, the tool apparatus further comprising:
 at least one braking body, 
 wherein the tool apparatus is adapted to bring, in the course of a braking procedure, the at least one braking body from a release state into a braking state, 
 wherein, in the braking state, the at least one braking body is in contact with the shaft and thereby exerts a braking force upon the shaft, so that the shaft and thereby also the tool are braked and 
 wherein in the release state the at least one braking body is not in contact with the shaft, 
 wherein the tool apparatus is adapted to bring, in the course of the braking procedure, the one or more braking bodies from the release state into a carry-along state and from the carry-along state into the braking state, wherein, in the carry-along state, the one or more braking bodies are carried along by a movement of the shaft, so that the bringing of the one or more braking bodies into the braking state is assisted by way of the movement of the shaft. 
 
     
     
       2. The tool apparatus according to  claim 1 , comprising a plurality of braking bodies which are distributed around the shaft in a circumferential direction, wherein the tool apparatus is adapted to bring, in the course of the braking procedure, the plural braking bodies from the release state into the braking state, wherein in the braking state the plural braking bodies are in contact with the shaft and thereby exert a braking force upon the shaft, so that the shaft and thereby also the tool are braked and wherein in the release state the plural braking bodies are not on contact with the shaft. 
     
     
       3. The tool apparatus according to  claim 1 , wherein the tool apparatus is adapted to bring the at least one braking body from the release state into the braking state by way of pivoting. 
     
     
       4. The tool apparatus according to  claim 1 , wherein the at least one braking body each comprises a first contact section with a ramp-like contact contour which in the braking state is in contact with the shaft. 
     
     
       5. The tool apparatus according to  claim 1 , wherein the tool apparatus further comprises a braking section which surrounds the shaft. 
     
     
       6. The tool apparatus according to  claim 5 , wherein in the braking state the at least one braking body is clamped between the braking section and the shaft. 
     
     
       7. The tool apparatus according to  claim 1 , wherein the tool apparatus comprises an actuation section, which is in contact or can be brought into contact with the at least one braking body, and is adapted to carry out an actuation movement with the actuation section in order to cause the at least one braking body being brought from the release state into the braking state. 
     
     
       8. The tool apparatus according to  claim 1 , wherein the tool apparatus is adapted to detect an emergency state and to activate the braking procedure on the basis of the detected emergency state. 
     
     
       9. The tool apparatus according to  claim 8 , wherein the tool apparatus is adapted to detect, as the emergency state, a contact between the tool and the human body. 
     
     
       10. The tool apparatus according to  claim 8 , wherein the tool apparatus is adapted to detect a kickback as the emergency state. 
     
     
       11. The tool apparatus according to  claim 1 , wherein the tool apparatus is adapted to bring the tool to a standstill within 10 ms or less by way of carrying out the braking procedure. 
     
     
       12. The tool apparatus according to  claim 1 , wherein the tool apparatus is adapted to bring the at least one braking body from the braking state back into the release state. 
     
     
       13. The tool apparatus according to  claim 1 , wherein the tool apparatus is adapted in a manner such that the at least one braking body can be brought from the braking state back into the release state by way of a manual actuation. 
     
     
       14. A method for braking a drivable tool of a tool apparatus according to  claim 1  comprising at least one braking body, the tool being coupled to a shaft, comprising the step:
 bringing the at least one braking body from a release state, in which the at least one braking body is not in contact with the shaft, into a braking state, in which the at least one braking body is in contact with the shaft and thereby exerts a braking force upon the shaft, so that the shaft and the tool are braked, 
 wherein in the course of the braking procedure the tool apparatus brings the at least one braking body from the release state into a carry-along state and from the carry-along state into the braking state, wherein, in the carry-along state, the at least one braking body is carried along by a movement of the shaft, so that the bringing of the at least one braking body into the braking state is assisted by way of the movement of the shaft. 
 
     
     
       15. A tool apparatus with a drivable tool, the tool apparatus comprising a shaft which is coupled to the tool, the tool apparatus further comprising:
 at least one braking body, 
 wherein the tool apparatus is adapted to bring, in the course of a braking procedure, the at least one braking body from a release state into a braking state, 
 wherein, in the braking state, the at least one braking body is in contact with the shaft and thereby exerts a braking force upon the shaft, so that the shaft and thereby also the tool are braked and 
 wherein in the release state the at least one braking body is not in contact with the shaft, 
 wherein the tool apparatus is adapted in a manner such that the at least one braking body can be brought from the braking state back into the release state by way of a manual actuation.